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Magnetic separator for hot mixtures containing magnetic components
| Details |
Inventors: Collin, Per Harald;
Assignee: Allmanna Svenska Elektriska Aktiebolaget (Vasteras, SW)
Primary Examiner: Halper; Robert
Assistant Examiner:
Attorney, Agent or Firm: Kenyon & Kenyon Reilly Carr & Chapin
A magnetic separator for a hot mixture has an enclosure with a bottom having means for fluidizing the mixture which travels through the enclosure from an entrance to an exit. Within the enclosure an internally water-cooled drum rotates and which is internally provided with magnetizing means so that magnetic particles in the fluidized flow, into which the drum dips, is picked up and through a suitable discharge carried out of the enclosure, other material in the mixture and which is non-magnetic, discharging from the enclosure. Internally the drum has means for maintaining a body of water in the drum's portion which dips into the fluidized flow, the flow of hot mixture causing the water to vaporize and cool that portion of the drum. |
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DETAILED DESCRIPTION The purpose of the present invention is to provide an apparatus or magnetic separator capable of effectively separating the magnetic iron particles from the non-magnetic coke particles, and other non-magnetic particles may be included in the mixture, without reducing the temperature of the mixture any more than is required for the magnetic separating phase, so that the separated magnetic particles can be sent on for the production of a melt, while the magnetic particles retain a substantial amount of the heat put onto them for their direct reduction from the iron ore and in the presence of the coke particles, while resulted in the mixture which requires separation.
In addition, due to this, the apparatus to be used must be capable of operating effectively under the elevated temperature conditions involved.
According to the invention, this is done by providing an enclosure having an inlet and an outlet and a bottom to which pressurized inert gas is introduced under a pressure adequate to fluidize the particles as they flow from the entrance to the exit within the enclosure.
A refractory drum dips into the flow of fluidized particles and is internally provided not only with a stationarily positioned, arcuate array of magnets, but also with a means for maintaining a puddle or body of water in the bottom of the drum which, under the temperature conditions involved, boils and by evaporation constantly maintains the dipped portion of the drum under highly cooling conditions.
By rotating the drum at an adequate speed, the picked-up magnetic particles, after leaving the segment of the drum having its external segment provided with the magnetic field, are centrifugally thrown away, the upper portion of the drum having an inverted funnel-like discharge opening for the separated magnetic particles.
With the fluidizing means requiring compressed gas, the pressurized gas used for this purpose escaping upwardly through the layer of traveling particles, the interior of the enclosure is under a relatively high gas pressure, and because the enclosure provides an escape for this pressure only through the magnetic particle discharging means receiving the particles from the drum, the pressurized gas used for fluidizing the flow through the enclosure, performs the additional function of pneumatically carrying the magnetic particles through the discharge opening of the enclosure
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